ipc: save local user and group id-s for ipc objects

5468  semctl(0, 1, IPC_SET, 0x7ffd25bcb590) = -1 EINVAL (Invalid argument)
Reported-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

ipc_ns.c

@@ -47,10 +47,10 @@ static void fill_ipc_desc(int id, IpcDescEntry *desc, const struct ipc_perm *ipc
 {
 	desc->id = id;
 	desc->key = ipcp->KEY;
-	desc->uid = ipcp->uid;
-	desc->gid = ipcp->gid;
-	desc->cuid = ipcp->cuid;
-	desc->cgid = ipcp->cgid;
+	desc->uid = userns_uid(ipcp->uid);
+	desc->gid = userns_gid(ipcp->gid);
+	desc->cuid = userns_uid(ipcp->cuid);
+	desc->cgid = userns_gid(ipcp->cgid);
 	desc->mode = ipcp->mode;
 }